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Proceedings Paper

Quantum cryptography with an ideal local relay
Author(s): Gaetana Spedalieri; Carlo Ottaviani; Samuel L. Braunstein; Tobias Gehring; Christian S. Jacobsen; Ulrik L. Andersen; Stefano Pirandola
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Paper Abstract

We consider two remote parties connected to a relay by two quantum channels. To generate a secret key, they transmit coherent states to the relay, where the states are subject to a continuous-variable (CV) Bell detection. We study the ideal case where Alice's channel is lossless, i.e., the relay is locally in her lab and the Bell detection is perfomed with unit efficiency. This configuration allows us to explore the optimal performances achievable by CV measurement-device-independent quantum key distribution. This corresponds to the limit of a trusted local relay, where the detection loss can be re-scaled. Our theoretical analysis is confirmed by an experimental simulation where 10-4 secret bits per use can potentially be distributed at 170km assuming ideal reconciliation.

Paper Details

Date Published: 13 October 2015
PDF: 4 pages
Proc. SPIE 9648, Electro-Optical and Infrared Systems: Technology and Applications XII; and Quantum Information Science and Technology, 96480Z (13 October 2015); doi: 10.1117/12.2202662
Show Author Affiliations
Gaetana Spedalieri, The Univ. of York (United Kingdom)
Carlo Ottaviani, The Univ. of York (United Kingdom)
Samuel L. Braunstein, The Univ. of York (United Kingdom)
Tobias Gehring, Technical Univ. of Denmark (Denmark)
Christian S. Jacobsen, Technical Univ. of Denmark (Denmark)
Ulrik L. Andersen, Technical Univ. of Denmark (Denmark)
Stefano Pirandola, The Univ. of York (United Kingdom)


Published in SPIE Proceedings Vol. 9648:
Electro-Optical and Infrared Systems: Technology and Applications XII; and Quantum Information Science and Technology
David A. Huckridge; Reinhard Ebert; Mark T. Gruneisen; Miloslav Dusek; John G. Rarity, Editor(s)

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